Electrical transformer for regulating or varying the voltage of the current supplied therefrom



F. E. BERRY.

ELECTRICAL TRANSFORMER FOR REGULATING 0R VARYING THE VOLTAGE OF THE CURRENT SUPPLIED THEREFROM.

APPLICATION FILED DEC-27,1918.

1,422,653, Patented July 11, 1922.

UNITED STATES PATENT orrlcs.

FREDERICK EDMUND BERRY, 0F HAYES, ENGLAND.

ELECTRICAL TRANSFORMER FOR REGULA'IING 0R VARYING THE VOLTAGE OF THE 4 CURRENT SUPPLIED THEREFROM.

Specification of Letters Patent.

Patented J uly 11, 1922.

Application filed December 27, 1918. Serial No. 268,506.

To all whom it may concern:

Be it known that I, FREDERICK EDMUND BERRY, a subject of the King of Great Britain and Ireland, residing at Hayes, in the county of Middlesex, England, have invented Improvements in or Relating to Electrical Transformers for Regulating or Varying the Voltage of the Current Supplied Therefrom, of which the following is a specification.

This invention relates to improvements in apparatus for regulating the voltage of the alternating current supplied from a static electrical transformer and it has for its object to provide means or apparatus for this purpose which shall be simple and inexpensive in construction, durable in character and easily manipulated.

The accompanying drawing illustrates diagrammatically my improved voltage regulating means applied in connection with a single phase static transformer, the voltags regulation being effected in connection with the secondary winding of such transformer.

In this example, a is the primary winding and b the secondary winding of the main transformer marked collectively T. The

main regulating switch, marked collectively S, comprises two movable contact makers or brushes 0 and d which are insulated from each other and arranged to move respectively over two stationary contacts 6 and f which'are also insulated from each other. The movable contacts or brushes are arranged, to make connection with the successive contacts 6, Z2 b 7), connected to the respective ta pings, of one of the secondary windings which, in the example, is the secondary winding 6. The stationary contacts e and f may, as shown, conveniently be in the form of concentrically arranged metal segments of rings and the movable contacts or brushes 0 and d be arranged to rotate over them and to make connection with the successive contacts 6 b 6 6, connected to the tappings of the windings b, the brush 0 being arranged to make connection with the stationary segment f and the brush (Z being arranged to make connection with the segment 6. The two brushes 0 and (Z are connected together mechanicall and so arranged that they can be move collectively into a position to bridge or bear upon contacts connected to the ends of any section of the secondary winding 6 to be regulated. One end of the secondary winding 6 is connected to an electric supply conductor 9 and the brush (1 can be caused to bear upon a contact I) connected to such end of the secondary winding whilst the brush 0 bears upon the contact 6' connected to the tapping connected to the end of the first section of such windlng. The opposite end of the secondary winding Z) is connected to an insulated contact I) with which brush 0 will make connection when brush 0? makes connection with the contact b connected to the last tapping of the winding. The two metal segments 6 and f are respectively connected to contacts h and k to which the respective ends of the winding 2' of an auto-transformer are connected, the saidwinding being provided with a numbe'rof tappings i 2', i 1' along its length connected respectively to stationary contacts j j j j. The supplementary regulating switch marked collectively S for use with this auto-transformer comprises a stationary contact is, conveniently in the form of a segment of a ring, as shown, connected to the second supply main or conductor 9 associated with the main transformer winding 6 and a movable contact or brush m, conveniently a rotary one; as shown, adapted to move over and in connection with the stationary contact is and to make connection with any one of the stationary contacts it, j, j 7' 7', 72, connected to the ends and tappings of the autotransformer winding z. With the arrangement described, one or more sections of the secondary winding b can be connected to the supply mains or conductors and one or more In an electrical transformer, the combina- 110 tion with one of the secondary windings of said transformer provided at intervals along its length with leads dividing said winding into sections, and a supply conductor connected to one end of said winding, of voltage regulating means comprising consecutively arranged stationary terminal contacts connected to said leads and arranged in a substantially common plane, two insulated stationary segmental contacts also in a substantially common plane, two movable switch arms insulated from each other and constantly bearing on the respective segmental contacts and adapted to simultaneously bear against any tWoadjacent terminal contacts so as to connectthe interposed section of the winding across the segmental contacts, an auto-transformer winding having its ends connected across said. segmental contacts, a series of insulated terminal contacts connected to the ends and to intermediate portions of the auto-transformer Winding, and a supplementary movable switch arm in constant electrical connection with a second supply conductor and adapted to be brought into connection With any of the terminal contacts connected to the Winding of the auto-transformer, substantially as described.

Signed at London, England, this ninth day of December, 1918.

FREDERICK EDMUND BERRY. 

